645151122 has 128 divisors (see below), whose sum is σ = 1892782080. Its totient is φ = 157697280.

The previous prime is 645151057. The next prime is 645151123. The reversal of 645151122 is 221151546.

645151122 is a `hidden beast` number, since 645 + 1 + 5 + 1 + 12 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (645151123) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 66123 + ... + 75249.

It is an arithmetic number, because the mean of its divisors is an integer number (14787360).

Almost surely, 2^645151122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645151122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (946391040).

645151122 is an abundant number, since it is smaller than the sum of its proper divisors (1247630958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645151122 is a wasteful number, since it uses less digits than its factorization.

645151122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9173 (or 9167 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 645151122 is about 25399.8252356192. The cubic root of 645151122 is about 864.0797331895.

The spelling of 645151122 in words is "six hundred forty-five million, one hundred fifty-one thousand, one hundred twenty-two".